When does Ornn's optional gear reveal happen?
Source: Unleashed Rules FAQ and Clarifications Ornn, Blacksmith says I may reveal a gear from the top cards and draw it. Do I choose whether to reveal when the ability triggers or when it resolves?

When you play me or when I hold, look at the top 4 cards of your Main Deck. You may reveal a gear from among them and draw it. Then recycle the rest.
Artist: Kudos Productions
Card Set: Spiritforged
Source: Unleashed Rules FAQ and Clarifications Ornn, Blacksmith says I may reveal a gear from the top cards and draw it. Do I choose whether to reveal when the ability triggers or when it resolves?
I attack with Teemo into Ornn at 12 Might from 8 gold tokens and cast Switcheroo. Teemo becomes 12 Might, but is Ornn at 9 or 1? What if Ornn gains or loses a gear afterward? Does Switcheroo reapply? How does Switcheroo interact with Ornn's static gear Might?
A player asked whether Ornn, Forge God counts as gear for Ornn, Blacksmith's passive that gives +1 Might per gear, and whether gold tokens count. Does Ornn, Forge God count toward Ornn, Blacksmith's passive bonus?